Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1992-06-29
1994-05-10
Hail, III, Joseph J.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
72200, 242 786, 414911, B21C 4724, B21C 4716
Patent
active
053101316
DESCRIPTION:
BRIEF SUMMARY
The present invention is directed to a method and an apparatus useful in the transfer of high-temperature slabs or strip from one or more slab-producing assemblies such as continuous casting machines, to an in-line or off-line hot reduction mill.
BACKGROUND OF THIS INVENTION
Three prior patents of major importance in this field are the following: Canada, Limited; Canada, Limited; Canada, Limited.
Prior to the innovations represented by the above-three patents, the conventional method of rolling hot metal strip involved the heating of an ingot or slab to approximately 2300.degree. F. (for steel) and reducing it in thickness by rolling it through a series of rolling mill stands. Normally, the rolling sequence took place in two stages referred to as roughing and finishing.
In the roughing stage, the slab or ingot was normally rolled through one or more rolling mill stands in a series of passes until it was reduced in thickness to a transfer bar approximately one inch thick. The roughing mill stage would typically include one or more vertical edging mills.
Following the roughing operation, the transfer bar was transferred on table rolls to a continuous finishing mill train where it was further reduced to the desired gauge.
Certain problems were encountered in the above-described conventional method of rolling hot metal strip, particularly arising from the long length of time that it took the transfer bar to feed into the finishing mill train. In order to address these problems, the inventions represented by the three U.S. patents listed above were developed.
Essentially, these three patents relate to the construction and operation of a downcoiler (and improvements thereon), capable of wrapping a strip or transfer bar about itself into a coreless coil (i.e. a coil with an open central eye), in which the heat contained in the strip was largely retained and not allowed to dissipate away. The heat retention arose from the compact form assumed by the strip or transfer bar when coiled upon itself.
The improvement represented by U.S. Pat. No. 4,005,830 related to the combination of a downcoiler with means allowing the simultaneous uncoiling of a previously coiled strip and the coiling-up of a new strip. In order to accomplish this, U.S. Pat. No. 4,005,830 describes and claims the use of pivotally mounted transfer arms, one on either side of the coil, equipped with inwardly directed stub mandrels capable of entering the open eye of a coil and then swiveling through approximately 100.degree. in order to move the coil from a coiling location (directly downstream of the bend rollers) to an uncoiling location further downstream. one major advantage of this construction is that it allowed a coiled-up strip to begin uncoiling at the coiling location, and then be transferred to the uncoiling location while uncoiling is taking place, so that the uncoiling can be completed in the second location. Meanwhile, a new strip or transfer bar could begin coiling up at the coiling location.
While the method and apparatus set forth in U.S. Pat. No. 4,005,830 represented a marked improvement over previous approaches (and have met with considerable commercial success) there is still room for further improvement in order to address the following disadvantages of the prior system using transfer arms.
a) Because of the high temperature of the strip or slab when it is in the coiled condition, considerable heat loss takes place from the hot edges, radiating laterally away from the coil. Heat is also radiated from the hollow eye of the coil. Although the use of heat shielding was known at the time the invention set out in U.S. Pat. No. 4,005,830 was made, the arrangement of the various elements in that prior patent were such as to prevent the use of close-lying heat shields to substantially limit heat loss from the hot edges and the coil eye. More specifically, the presence of the transfer arms and the necessity that the transfer arms be capable of lateral movement parallel with the coil axis, prevented the positioning of heat shields where
REFERENCES:
patent: 2687878 (1954-08-01), Montgomery
patent: 4005830 (1977-02-01), Smith
patent: 4019359 (1977-04-01), Smith
patent: 4306438 (1981-12-01), Child et al.
Patent Astracts of Japan, vol. 4, No. 187 (M-48) (669) 23 Dec. 1980, & JP-A-55 133803 (Hitachi) 18 Dec. 1980, see the whole document.
Bailey Francis I.
Monaco Gaetano
Newton Lorn D.
Hail III Joseph J.
Rollins John
Stelco Inc.
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